为解决线形微动方法在地下工程勘察数据采集和处理中所面临的噪声信号源偏离测线方向的问题，采用偏振分析方法，结合理论研究和现场实践，提出一种城市强噪声环境下的微动勘察技术，可实现数据的有效采集和准确处理。该技术已在深圳市罗田水库—铁岗水库输水隧洞工程中得到应用，应用结果表明： 1）偏振分析方法可用于城市强噪声环境下线形微动数据方位角的计算，得出不同优势来源噪声信号的方位； 2）当噪声源偏线角度较大时，可对数据进行分频偏振分析，求取方位角信息并用于微动数据处理，进而得到测区更加准确的视横波速度剖面。
The noise signal source deviates from the survey line
direction during data collection and processing of underground engineering
survey using the linear microtremor method. Hence, the polarization analysis
method is adopted, and a microtremor survey technology in urban strong noise
environment is proposed based on theoretical research and onsite
practice, allowing for effective data collection and accurate processing. The
proposed method is applied to the water conveyance tunnel project from Luotian
reservoir to Tiegang reservoir in Shenzhen, China. The outcomes indicate the
following: (1) The polarization analysis method can calculate the azimuth angle
of linear microtremor data in strong urban noise environments, obtaining the
azimuth of noise signals from different sources. (2) When the deviation angle
of the noise source is large, frequency division polarization analysis can be
performed on the data to obtain azimuth information for micro motion data
processing, resulting in a more accurate apparent shear wave velocity profile
in the measurement area. This technology improves the quality of survey results
by accurately correcting the orientation of survey data.
